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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53aa0b8d80b3be013cdde000ab632a62b8a5aaf59eef667f441864221d15e6fb' 
  AND token = 'XF9jOIN8Wwku44UJ7Y3JCLHE52n1gePQly3odNCm/Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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