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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aca68fd76b235446bf655be371e95eef971b7fb36b3a6c12307366245de31fce' 
  AND token = 'Da4du6flqq2hE+3/44tfqErpvbm0PriZo7ZU7N+APh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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