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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b15a2a0f5175a0309924a7d24c72a4fcc776f4b7641e8cc81fd75744b50efd' 
  AND token = 't6MDJTLeRhm72ztmX7VEHwMQvCcnyud0hESO55Fjz/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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