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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e44d9099cff1e7e7c3e5a98e71da882f614c0ba587df201f4a7b2a9c18f580' 
  AND token = 'ikaKF+imQYlxa0nRmDq6e7Z5HhfCB00GeBMkM0EIJCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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