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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c3cf7e7ce60a2fc5d27875b3b9231725046d957b6d4e0af4f1aac6c2976e93' 
  AND token = '1NId6F909uylfyN08D3tFuNuUxU6RsRDfyNKqsHSQho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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