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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b0608fe8bc7d4e1ba21681ed5e678b1fcfe58f02725c8cb34d9ea403ef6717b' 
  AND token = 'NJmnjHdwXVLJOAgdz66rNuxWEvVfFe+kXtigKaS2AnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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