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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce509fe0544047764c5bf25c0e668d19fd54eb5e61bba8fa54cdeb4e9d9f7bb2' 
  AND token = 'uhI8UZNRjgZ7+ClELSQauah7dezFnbyGHIcPhY1bysw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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