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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '415d41f9c1f63402ca129c1b43d958a3cbba909a62378f4dbc20937ba11cb98e' 
  AND token = 'ES9R3HDklN3GspvqRsDAn/vYVNlKR3zyQYvVcGuXtd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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