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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9455490e100381487b7c1cd821e5c05e9c4c51f34780c610d52d47d1da32e9b' 
  AND token = 'j832E99STE6PcFCr0TPVPlhNzqqPlkRH2ZTfzNcLs3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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