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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f96345ffb1b4801a5086a5640386581479897598918601ee3b4c4cf2a6af165' 
  AND token = '7hppmn0nA8UDNBEoh2IbrAbVhmikl5GYtGdg7h3s4u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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