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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a83e51fca581a07127cadc2e140ca8136012b252f9c518844b7989b83ea6370' 
  AND token = 'RPlVxNu3bLtEqCT22ciuz46T6rOlnxMs0C5ipgkjsLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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