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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed3459875885d2b1a48f2840033fa5e3bc4ba6731db3ae1ea985ded4bb1cbb10' 
  AND token = 'wNqLz5cu15PhEXCqwxEJ5/orldk2B+SaxFDI3HH6fds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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