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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ff143158a3d192323af336c694ab44cfefd4824b99d091e4d1361919054093' 
  AND token = 'wFyuVWlSqobhkPDXhU/Bla2sp3OZwVemOwBmBUyK86A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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