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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0067e8e234539ca7a340684e92bb14643efae704064f39709cdd5c4564b26aa8' 
  AND token = 'pGl118NHnbR3FGvuOcNKfF5AOUe2HWlY646i9e0RlWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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