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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf8bccd86184318e8636e2ac9a1c703d52a5a15f6f81a5d9e544a002aa55f26' 
  AND token = '8geEMhQb81xcsmGjHNApR0HQhhhkH79+Lu+ktj5tVTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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