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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecbe076fc668839372720fdadeb4b97c3ecf99feede3155704d133f6bf00025e' 
  AND token = 'o6jMjyCBKf8yvr3Z925KwLBblFARmTypB0tYf4d41wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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