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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c16c408f36181cb74038f374332d92a62b18550f5ccadf90d9ef0fd185b6d2c' 
  AND token = 'XuaBPihN0onMf5CMyO40ARPHLE4/QFnb19yWe2k30QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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