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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb68f38112af083d8d0057a433034689f10f7956f8e353a713cf9a8cc9b8ff0a' 
  AND token = 'CfnvXq7Otkw39kI/gJJXOcoLRh8DhLm6WdbIF4Vz7N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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