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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70929a624c1102b43c0de3e0c2c0463412c12c4bc63556ec2b1ad4c2451275cf' 
  AND token = 'd2Esws018Eaqm79V+fTRP24m+hOksWu3R49LPjF9BwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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