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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bdd9bd0bea1559f7d9efcbfbfbcbb1910a04d5b40283c7b91b2b8d2f422355b' 
  AND token = 'Hy62A7KsFJTvOXbddvM+gxvAILpa+2ZoUc/7O58LsUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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