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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c564cdabe4539f92ce9a44b1819eff76f8e27bbb5b87d61896c2ea9ce99481' 
  AND token = 'c3Jh7dfGcHu4BJLR3mYdVmlCXo+TPTX7QPQt6cIA1IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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