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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9052f39cf47352606d5c6c90786a4359a35ee8964053d9b9b602b2742bc4fcb9' 
  AND token = 'ED5XMsjph4wT7iDi9vwOLm7DjJtv3VLNLbZwsEfiUoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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