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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1303eed455bb0bb16292cd82b38015e93977438f6810410b114198fb48a5de5e' 
  AND token = 'McrLWHUkGT59LsDLKkp30oB6r6MXuNUs9OgNV9w+q5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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