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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b79156426b1d267b087ee662f4a3af8a8c355aafd45209250f6348c87a62ce6a' 
  AND token = 'GRvdDhjc4e02qCrC+SiEcDKo6pndsKZhi0jUk7N0nd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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