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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adccc54eb9a45fde7f3cefe1215c51fd98ab2a1a22c4b4360652b42ae3037615' 
  AND token = 'CkeB8fC+8WP/Rm3d8k7/JCvLSP71FaHfMeEiWrwrTH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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