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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e21536335633d5227d1129bd7da78de9cbcc8e6bcc1dab0e3e895a80a1a998' 
  AND token = 'Z5dCP8SISUyjvEBvET5gkld2G+14A0y1XqcvCq8b3dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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