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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56de1fcafdbe89e5c51243afa24981613b5b82f2667c3c50daf40fa81e9dd5e8' 
  AND token = 'SD86PeY/ymQ8fzhcM/ijFRO7AhvUOjkrHDkntBKafQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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