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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36f163f4a4c116c7cacb3daf8b12107d36d3b3201d2d2746c9df1df5f6b4028' 
  AND token = 'CJbbsRf0qS9REh3udW9I/gu77jS1TNJEfHKwYkBFyCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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