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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '209ec8a7bedac2925095e9f05edffa747e4f33f515fee53754baa7328b0230c9' 
  AND token = 'xrI1FjOMkovxWN9eLD8KKxFjhfc6F9rZCt24Mb4EspQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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