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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b05d7620a8433348727002394e5c7b68d93043a347bd1b68a590677346906d56' 
  AND token = 'dLFr8fi3kx7Vo+UnStDXe+IjB+zZeb58ywStw5zwHAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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