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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b248ad914ff7944775d947185c0faf612e9dc602f6da60f41e664cbb8303f7' 
  AND token = 'mzQ5i4eay889yibdaGu5DdReyugaCS3wSvbQABBKf8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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