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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136b483fa54b9abcf4076ea8390eff5b86d337d180672039d563ecb5a5ae28f7' 
  AND token = 'eYhjR6pJmfRkhyfK5cek4+upZE34cdgB6ozzpwYaPc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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