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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d42c8bc827a9ea35b4f6a3d51172e16fdc890cde4e88cd3453d19b578f552c' 
  AND token = 'PDTMKtF27ozfpVJw3kL4PO5HSOhC93THVS7+YFKIVzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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