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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9931768bc0bb527d52e4cd33f50f9bc1639830ef12f2f517c59a73698195c881' 
  AND token = 'BMS77R7gBa5ls1RwfGoQo3k9swGWv+5HFQGkoKksGSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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