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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6167d879e9c911cfab89fa57e24580eb9ff9bfedf826048cb80228f60b55ff6e' 
  AND token = '56Tcpm7Nia4EkOwtgR932qRTWIi2bL0lMMN6tqfAa+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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