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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95ee453d03bf50198e8553c86e832760610e402e46ad6343be2f0c35ec66064' 
  AND token = 'ikhyH/OeMpGXsRhDi9yEcvGdhJVxyJv0xRAFaWCieqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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