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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '935dae82ba497e13205cefb374b97d15550d205279f5aba8aa223ddfe8e880e8' 
  AND token = 'CAeq4jB7ewZUR6syeqFbu3bd5HCzkEq3A5chlnSOKGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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