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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5275523194319e85709a4a97306b88e0259a022f03c06b93c7893f4f32b5ede4' 
  AND token = 'nMP0Hv7cQImWA5LV9pmPPABuZ7gs2+/SUFwNvV5pnWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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