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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c1c45322e9b3e318b405c0bd092025fb2517e3631728e890ba5a1d7e7960f7' 
  AND token = 'Qfiyzm+PscnxKNFQ+AtUNqMXRmh5wKnEvYP400w7aKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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