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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f9679f624ce554a69a45e2f8ef6189c173e77361c58f99dcfc97e09ea8f584b' 
  AND token = '//NxYA2+E8rTBYYIg8dzVJt+YA1wUIM2MIGUNXBf5sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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