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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0872d69235e9a3dd6e28c0665986cb593ae019d1e81eb76216d289a3fd82f733' 
  AND token = 'fKvLmvKQ9KmPZTgMOzIlrAWk/XT2kCXLTuu8+k30H64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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