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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa9f525c14324e5e43e97272662feed763e3c819bda2634f1402d25afc90e7a4' 
  AND token = '+URbNeuAn2hOl+MaODNrc6tQ7aFUffhRKWow84yEhoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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