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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052331ae92575787f5e7429d152a2001a0a4803454ea18510e3e338d2d35b9e0' 
  AND token = 'Y0sYkUz/Auqio7LAyvhdA8r3+l0kH9WVMAcFmOHy59M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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