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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adf773c7b7d714f5d98550ab2ad9e3496502d2aa96741d1f181185b3f8b2fbc1' 
  AND token = '60cCRSE2TwMQJ0zRVhMbxRRVoKkZEM74277Q/GTLq+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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