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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55082b9be35a556299577ae53c485644a045d66f6520381908c0b5d973fe6da6' 
  AND token = 'RUFLSBf/p8cUCdio6U8WdRYbYw1HYlVQGj8gIZbXXoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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