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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802c0fa111e46cb40c1995d38da2bb7f37e5c7440f44ffb32ce5a8213959bc4e' 
  AND token = 'OH+hmlb0j+QwLiqpqsrw7I4vPrA4s5pvfH5iG295+34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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