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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e5bc7a2f4846f893b5bfaf6bd6186b8bae12af2722f16b6f36384856466c73' 
  AND token = 'RLLTn8U/xwYuey7S5Gj5n1f6eFffAg4Wy66IzqHASQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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