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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '248bfcc99a28d0f631119febd1c6c69d4d3f51731ea4dd92d11f642d836ec367' 
  AND token = 'MofX+B9Pw5juktlg55G9BM4y0iuI8HbqTSEBmv94zJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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