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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7d57ebc1a238a435dc156d09a1182c8e27170abac4b097ee412cd3a4b65fea' 
  AND token = 'Ij3bdbtt1cPdAwi0yfVXK+Ze49aESoBRn92Bs73w3F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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