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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8851292b228abb114df9f6e9c3de9355a28c9359c997e1ce9cd260d42e28a2d' 
  AND token = 'vS9LZoHVwmwdGKiCp1MnjDnRMk0w3qz5zc60KVWzksw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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