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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72975817494c8f00d232455470164e419ea4cdbf16f8ed2fead14a9c523b0538' 
  AND token = 'LiR30islC32DmIBnPCo0quJNYpo6G3cXn2jeJqNhNNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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