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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac91315e25b56e52f74b523e1b37908d5e3f6acca57fb606842530088feb41c' 
  AND token = 'il1SA14eso9l0hSVqK/Kq8zeAVRKjpAMeN8gjSlQhhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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