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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f021236a239c70dc8e69f52b6a046e689d526546818917ab9b6a94ff240dcefc' 
  AND token = 'w5FSGMmInPFt9owrN/bcf6rO5bNcnYNR4yR43U9XNg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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