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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4d497844b7f6ab11443534940ff589f5ea6f1f09e6a2019dae1b5472351a4c' 
  AND token = '32/8r5NlK7WklewgOgvt2VnqYXa6YVm2xkHXLLxRWQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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