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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96839963fb1303dfcc0bbfcc47f3ee87b1f1405b6aefa949bf3efd4e9c76a25d' 
  AND token = 'whYa/TB7726BzsTxNdXqVebskx4/k4zj44Fhu7FKWwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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