SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f277d700741575cb37b523bd73281d9c3dfd5941341999fa5a66f32c78055cc' 
  AND token = 'aT+ibj2Q8WAVKbVfbxqbiGBIDtGAmhA/DzpKaBfKKmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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