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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91c69bdabb57d9ad496f686034731e3d567e6630acd834c891e3e2fd32b6ac01' 
  AND token = 'uXfGlu779NDmvllVLF8w+288Itth5VXGDipcYHlfmWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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