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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90368499c1276f65bce2dcbe896a26d6d1e2c8939760629bd62a771a71cc3af6' 
  AND token = 'AlfWbEDwwSHee152LuLhwXpML+4phXXqTnL56r93iZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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