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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c093b39436c836cfe9eeb7ca4a1cbe24fb8d83e29e6f7ed1eea5983cd2153239' 
  AND token = '6Ant5m3cLam66RXy2sxktkqb+XNxH8hZQNzO7DIF5yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}