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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6280cab31ff1877f3d764399140fa38030342319e6349dedc8b5c9c4aeba2ee8' 
  AND token = 'VbANBTkBvQJrky/TCJ6ei6bc1xQ5RmSJpiIu/aes/04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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