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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8a97bd91772885b40efa6cadf48e7782c0b406d565ac0655eaba2bad8c6bafc' 
  AND token = '1HEtnGwtFZJYjzsW6kZzJCzMwUZqWIey8c9ZUprSG7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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