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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3029f70318d4eba4f93bdf75699564327a95a98d208d0055c9ad24876e28a59d' 
  AND token = 'LaAgqlJeDnP3B/SBfsuXF36y2WLB9olw613MfmsQNhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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